WooComemrce: Change number or products

WooCommerce-custom-product-count.php

//Set products per row
add_filter( 'loop_shop_columns', create_function( '$cols', 'return 3;' ), 20 );

//Set products per page
add_filter( 'loop_shop_per_page', create_function( '$num', 'return 12;' ), 20 );

Two ways to use this:

1. Create a plugin (recomended since it won't be overwritten if you update your theme):
   Copy the code above and save it into a new file in the folder wp-content/plugins/. You can call the file what ever you want, but it's good if the filename describes the purpuse of the file, for example: WooCommerce-custom-column-count.php
2. Edit functions.php in your theme:
   Copy + Paste the code above into functions.php in your theme.

Change the return value(3) to the value you want.